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Windows 7: External HDD can't be opened, but the laptop still can detect it

Hello,
I'm new here, so I'm sorry if I don't really get what exactly the informations should I share.
I have Toshiba HDD 1TB v63700-c and laptop ASUS A46CB using Windows 7 Ultimate x64.
Recently I can't open my HDD in my laptop, while my laptop still can identify that there is a drive connected via usb drive. When i use my brother's PC, i can access my HDD in My Computer.

I assume (by it's size) that it's a portable HDD (no power adapter). You say your unit "identifies" it, but not how. If it shows in Device Manger > Disk Drives, have you tried updating the driver? When you left click on it and choose Properties, does it say it's working properly? Did you use the same USB cable with your brother's machine?

Again in Device Manager, are there any Yellow Warning flags for either the HDD or any of the USB connections?

Did you install any Toshiba software with the HDD? If so, did you try uninstalling it?

If you can see it in Disk Management, have you made sure it shows as formatted for your unit?

in device manager, it says that the driver is the newest. It does say it's working properly.
For the USB cable, I used the same cable with my brother's PC.

In device manager, I don't see any yellow flags for either the HDD or the the USB connections.

I did not install any Toshiba software as long as I remember. I already checked it on the Programs and Features.

I'm not sure if it's formatted for my laptop, since the HDD is not on the list. But on the, I don't know, diagram(?) below, I noticed that my HDD is detected (Disk 1). Can I say that it's formatted or not?

I've tried different external HDD, and it worked just fine. I can access the files. Btw, I attached the screenshots in case my explanation isn't clear enough.

Okay, try this. Disconnect the Toshiba HDD, then see if you still have Storage Volumes > Unknown Device in Device Manager as you do in the screenshot. If it's not there, reconnect it, go back to Device Manager > Storage Volumes > Unknown Device and try to update the driver (it probably won't). If it doesn't, then try again but using Browse My Computer, then Pick From a List of Devices and see if your HDD shows up in the list. If it does, update the driver and see if that removes the Unknown Device. If it does, then you should be able to access your HDD. If you still can't access it, and you can on another machine, I'd copy it to a new drive and forget about the Toshiba HDD.

Try:
- Create a manual System Restore point - System Restore
- Remove the HDD
- Restart and run DriveCleanup as admin - Drive Tools for Windows
- restart and scan with CCleaner - scan normal and then registry
- restart and plug the HDD back in
- let Windows install the HDD

Go back to Disk Management, right click on the long space, where the capacity of the drive is written, post a screenshot of the options. Do you have the option to Change drive letter and paths? If so, click on it and assign a drive letter, one which you are not using.

If this doesn't work, try to remember what OS the other PC, where the drive showed up successfully, had. It could be with a different than NTFS or FAT32 file system (typical for Windows). If you can use it to access the drive and save the data from it to another device. Then you'll need to reformat for your PC.

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